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#ifndef SKY_ENGINE_PLATFORM_TRANSFORMS_INTERPOLATEDTRANSFORMOPERATION_H_
#define SKY_ENGINE_PLATFORM_TRANSFORMS_INTERPOLATEDTRANSFORMOPERATION_H_

#include "flutter/sky/engine/platform/transforms/TransformOperation.h"
#include "flutter/sky/engine/platform/transforms/TransformOperations.h"

namespace blink {

// This class is an implementation detail for deferred interpolations.
class PLATFORM_EXPORT InterpolatedTransformOperation
    : public TransformOperation {
 public:
  static PassRefPtr<InterpolatedTransformOperation> create(
      const TransformOperations& from,
      const TransformOperations& to,
      double progress) {
    return adoptRef(new InterpolatedTransformOperation(from, to, progress));
  }

  virtual bool canBlendWith(const TransformOperation& other) const {
    return isSameType(other);
  }

 private:
  virtual bool isIdentity() const override { return false; }

  virtual OperationType type() const override { return Interpolated; }

  virtual bool operator==(const TransformOperation&) const override;
  virtual void apply(TransformationMatrix&,
                     const FloatSize& borderBoxSize) const override;

  virtual PassRefPtr<TransformOperation> blend(
      const TransformOperation* from,
      double progress,
      bool blendToIdentity = false) override;

  virtual bool dependsOnBoxSize() const override {
    return from.dependsOnBoxSize() || to.dependsOnBoxSize();
  }

  InterpolatedTransformOperation(const TransformOperations& from,
                                 const TransformOperations& to,
                                 double progress)
      : from(from), to(to), progress(progress) {}

  const TransformOperations from;
  const TransformOperations to;
  double progress;
};

}  // namespace blink

#endif  // SKY_ENGINE_PLATFORM_TRANSFORMS_INTERPOLATEDTRANSFORMOPERATION_H_
